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Old 01-03-17, 09:30 AM   #1
MikeBoilerman
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Default Noisy Skandia semi-diesel

Hello everyone, my first post here.

I'm a narrow boater and I've had a few old diesels over the years. A 20hp Skandia 120B hot bulb semi-diesel marine engine came my way at a price I couldn't refuse, and never having owned a hot-bulb I went for it and had it fitted in into my boat.

Now the problem (well ok there are several, but this is the killer) is the sheer noise of the exhaust. The bark is truly ear-splitting and I don't know why this is. People can here me coming from two miles away! I saw the engine running on a trailer before buying it and the exhaust noise wasn't noticeably loud but now its installed in the boat, it is impossible.

So to my question. Can any of you here with experience of semi-diesels suggest what might be wrong with mine please? Or are they always ear-splittingly loud? I have no previous experience of semi-diesels other than seeing the odd Bolinder or Seffle in a narrowboat and they never sound particularly loud. Can mine be quietened and if so, how?

I'm on the point of giving up and having it removed and my lovely Gleniffer DB2 put back. Can anyone advise me on this please? Many thanks!
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Old 01-03-17, 09:45 AM   #2
Nev B
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Hi Mike , welcome to the forum, I will PM you an email address of a guy in Sweden who may be able to help
Cheers
Nev
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Old 01-03-17, 09:59 AM   #3
listerdiesel
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What size of expansion chamber is fitted to the exhaust?

Peter
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Old 01-03-17, 07:19 PM   #4
oliver
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Is the injection timing correct or is it retarded that would make it noisy
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Old 02-03-17, 12:49 AM   #5
MikeBoilerman
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Ok thanks for your replies everyone.

Got your PM thanks Nev.

Listerdiesel, the expansion chamber is about 26" x 18" x 12", water cooled cast iron and weighs about 150kG. And we fitted a second expansion chamber about 11" diameter and 30" long after that. Virtually no improvement.

Oliver, I have no manual so have no idea what the injection timing should be. I've fiddled with it by rotating the governor (loosening the nuts on the fixing studs in the base, which pass through elongated holes allowing the whole thing to rotate). That would change the injection timing I think. Is that right or is there another way to do it?
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Old 02-03-17, 12:09 PM   #6
ListerHA2
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Is it possible the lubricating oil is the wrong grade?
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Old 02-03-17, 02:27 PM   #7
martinpaff
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I guess the obvious question is: you saw it running before you purchased it - have you been back to the seller to ask for advice? What have you changed since you bought it - change it back!

Generally, a very loud (and hot?) exhaust means retarded ignition - firing too close to TDC (or even after!). With a hot bulb this might be pump timing or just possibly an issue with the way its heated. It does sound (pun!) like you need to advance the timing.

MP
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Old 03-03-17, 10:52 AM   #8
MikeBoilerman
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Quote:
Originally Posted by ListerHA2 View Post
Is it possible the lubricating oil is the wrong grade?
With no copy of the manual, everything is possible!

I'm running it on SAE30 but are you suggesting the wrong grade of oil can actually change the exhaust note from the nice chuffing noise a semi-diesel usually makes to an ear-shattering bark?
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Old 03-03-17, 10:56 AM   #9
MikeBoilerman
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Quote:
Originally Posted by martinpaff View Post
I guess the obvious question is: you saw it running before you purchased it - have you been back to the seller to ask for advice? What have you changed since you bought it - change it back!
MP
Yes I have, and he is as flummoxed as me. Although he bought it from Sweden many years ago and never got around to fitting it in anything. I saw it running when I bought it, not noticeably noisy, fitted into the boat and on firing up after installation, EAR DAMAGE ensued. The engine was not touched or fiddled with in any way between buying and fitting, but obviously something changed. I have spent many hours trying to figure out what.
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Old 03-03-17, 11:03 AM   #10
MikeBoilerman
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Quote:
Originally Posted by martinpaff View Post
Generally, a very loud (and hot?) exhaust means retarded ignition - firing too close to TDC (or even after!). With a hot bulb this might be pump timing or just possibly an issue with the way its heated. It does sound (pun!) like you need to advance the timing.

MP
There seems to be a consensus emerging here that it is retarded timing. The whole governor rotates on studs through slots in the circular base and I've tried it in various positions but not a great deal of change is noted in the exhaust noise. Advancing it by rotating the governor results in a massive reduction in power though.

Can you expand on "possibly an issue with the way its heated" please? I'm not understanding what you mean there...

Thanks for replies everyone.
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